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Cummins Power Command Fault Codes

Cummins Generators

Troubleshooting Table

Fault CodePossible CauseRepair Suggestion
POWER UNIT WON’T STOP RUNNING—STATUS INDICATOR LIGHT ON1. Faulty Start/Stop switch.
2. Faulty ground connection.
Try stopping the Power Unit by squeezing off the fuel supply hose at the Power Unit.
POWER UNIT WON’T STOP RUNNING—STATUS INDICATOR LIGHT OFF1. Binding governor mechanism.
2. Misadjusted actuator.
Try stopping the Power Unit by squeezing off the fuel supply hose at the Power Unit.
STATUS INDICATOR LIGHT ON THE POWER UNIT STAYS ONBatteries are not connected correctly.
1. No battery voltage.
2. Faulty switch or wiring.
Reconnect batteries correctly.
STATUS INDICATOR LIGHT IS DEAD1. Connect batteries.
2. Try starting the Power Unit at its control panel if the Operator Panel or remote Start/Stop switch does not work, and vice versa.
POWER UNIT RUNNING (GENERATOR LIGHT ON), BUT NO AC OUTPUTA circuit breaker in the coach distribution panel has tripped or is OFF.Reset or turn on the coach distribution panel circuit breaker.
BATTERIES RUN DOWN1. Faulty battery connections.
2. Charger turned off.
3. Parasitic loads.
4. Worn out batteries
1. Check battery connections.
2. Charge batteries if necessary.
3. Turn Charger On using Operator Panel (p. A-21).
ENGINE CRANKS WHEN BATTERY IS CONNECTED1. Faulty Start/Stop switch.
2. Faulty ground connection.
3. Faulty starter solenoid.
Contact an authorized Cummins Onan dealer.
ENGINE WON’T CRANK BUT THE FUEL PUMP IS RUNNING1. Faulty Start/Stop switch.
2. Faulty ground connection.
3. Faulty starter.
Try starting Power Unit at its control panel if the remote Start/Stop switch does not work, and vice versa.
POWER UNIT IS HARD TO START1. Low fuel supply or air in fuel lines.
2. Dirty air filter or blocked air inlet or exhaust.
3. High altitude.
1. Fill up with fuel as necessary and prime for at least one minute.
2. Check air intake and exhaust for blockage and replace air filter as necessary.
POWER UNIT SMOKES1. White smoke:
A. Cold engine.
B. Air in fuel lines.
2. Black smoke:
A. Dirty air filter or blocked air inlet or exhaust.
B. Over fueling.
3. Blue smoke: Worn pistons and/or rings.
1. Smoke is normal if it clears up immediately. Avoid running at No-Load.
2. Fill up with fuel as necessary and prime for at least one minute if there is white smoke.
3. Check air intake and exhaust for blockage and replace air filter as necessary if there is black smoke.
4. Contact an authorized Cummins Onan dealer if smoke does not clear up immediately.
POWER UNIT HUNTS/SURGES UNDER FULL LOAD1. Low fuel supply or air in fuel lines.
2. Dirty air filter or blocked air inlet or exhaust.
1. Reduce loads if at high ambient temperatures or elevation.
2. Fill up with fuel as necessary and prime for one minute.
3. Check air intake and exhaust for blockage and replace air filter as necessary.
ENGINE HAS EXCESSIVE OIL CONSUMPTION1. Too much oil.
2. Missing oil fill cap.
1. Check oil level and drain excess oil.
2. Replace missing oil fill cap.
POWER UNIT STARTS OR STOPS WITHOUT START/STOP COMMAND1. System is in Auto (normal).
2. Faulty grounding.
3. Faulty Start/Stop switch.
1. Disable AUTO if normal starting is not desired.
2. Try starting/stopping Power Unit at its control panel if the remote Start/Stop switch does not work, and vice versa.
OPERATOR PANEL WON’T POWER ON1. The Coach DC Disconnect Switch is in its Disconnect position and Shore Power is not available or connected.
2. Battery charge is too low.
1. Turn the Coach DC Disconnect Switch to Connect or connect Shore Power.
2. Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
3. Check battery voltage. Charge/Replace if necessary.
OPERATOR PANEL SCREEN IS TOO DARK/LIGHT1. Contrast setting needs to be adjusted.
2. Extreme ambient temperatures.
1. Adjust contrast settings.
2. Ambient temperature may be too high or too low to turn on the pixels. Wait until temperatures are normal.
OPERATOR PANEL IS MISSING LINES OF DATANormal 3 to 5 second delay.Contact an authorized Cummins Onan dealer if lines do not appear.
CANNOT TURN POWER UNIT ON / OFF FROM OPERATOR PANEL1. Engine preheating (normal).
2. Coach DC Disconnect Switch is in its Disconnect position.
1. Wait up to 20 seconds for engine preheating (glow plugs) to finish.
2. Turn the Coach DC Disconnect Switch to Connect.
CANNOT TURN INVERTER / CHARGER ON OR OFF FROM OPERATOR PANELThe Coach DC Disconnect Switch is in its Disconnect position and Shore Power is not connected.Turn the Coach DC Disconnect Switch to Connect and connect Shore Power.
“ESTABLISHING COMMUNICATION WITH CONTROL” STAYS ON OPERATOR PANELCommunication wire between Operator Panel and Transfer Switch is missing or loose.Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
SHORE BREAKER KEEPS TRIPPING1. Shore breaker size set too high.
2. Too many loads
1. Reset breaker size using Operator Panel (p. A-17).
2. Reduce the number of loads.
HIGH OR UNUSUAL BATTERY CHARGE/DISCHARGE ON BATTERY STATUS SCREENShunt fuse blown.Replace the blown shunt fuse (p. 6-6).
BATTERY VOLTAGE HIGH AND FLUCTUATES IN GENERATOR OR SHORE MODEBattery fuse blown.Replace the blown battery fuse (p. 6-6).
BATTERY VOLTAGE LOW WHEN GENERATOR OR SHORE MODE STOPPEDBattery fuse blown.Replace the blown battery fuse (p. 6-6).
FAULT NO. 112/212—AC OUTPUT OVER VOLTAGE1. Very large AC loads dropped quickly—8 kW step or greater.
2. Defective Inverter/Charger component.
1. Reduce AC loads.
2. Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 113/213—AC OUTPUT UNDER VOLTAGE1. Very large AC transient load—8 kW step or greater.
2. System overloads:
A. In Inverter Mode, loads greater 3kW.
B. In Generator Mode, loads greater than 10kW.
3. Low PMA voltage or Engine Power.
4. Defective Inverter/Charger component.
5. Blown battery Fuse (400 Amp) . Indicated by dead operator panel. Only Shore Mode works.
1. Turn the air conditioning thermostat OFF, restart Generator Mode or connect Shore Power, and then turn the thermostat ON again. (This resets the thermostat so that it will start the air conditioners in sequence rather than all at once, greatly reducing the AC transient load on the Hybrid Power System.)
2. Reduce AC loads to see whether problem persists.
FAULT NO. 114/214—LOSS OF SYNCHRONIZATION1. Secondary/Primary Inverter/Charger shut down without issuing a fault.
2. Communications cable is faulty or missing.
3. Extremely unbalanced loads between the primary & secondary inverters will lead to synchronization issue or Fault Code 114/214.
Contact an authorized Cummins Onan dealer.
FAULT NO. 115/215—INVERTER FAULTThe Inverter/Charger that detected the fault in the other Inverter/Charger also shuts down.Contact an authorized Cummins Onan dealer.
FAULT NO. 116/216—BOOST OVER TEMPERATURE1. Insufficient cooling (liquid not air flow).
2. Defective Inverter/Charger component.
Check the system for coolant leaks.
FAULT NO. 117/217—CHARGER OVER TEMPERATURE1. Insufficient cooling (liquid not air flow).
2. Defective Inverter/Charger component.
Check the system for coolant leaks.
FAULT NO. 118/218—INVERTER OVER TEMPERATURE1. Insufficient cooling (liquid not air flow).
2. Defective Inverter/Charger component.
Check the system for coolant leaks.
FAULT NO. 119/219—AC OUTPUT SHORT CIRCUIT1. Loads are too large.
2. External short.
3. Internal Inverter/Charger component has failed.
Reduce Loads.
FAULT NO. 124/224—BATTERY TEMPERATURE SENSOR FAULT1. Sensor is disconnected or broken.
2. Sensor or sensor wires are corroded.
Contact an authorized Cummins Onan dealer.
FAULT NO. 125/225—HIGH DC BUS VOLTAGE1. Very large AC loads drop quickly—8 kW step or greater.
2. Engine speeds up too fast under light load.
Reduce AC load.
FAULT NO. 126/226—BOOST TEMPERATURE SENSOR FAULTDefective Inverter/Charger component.If ambient temperatures are extreme, wait until temperatures reach normal range to see whether the problem persists.
FAULT NO. 127/227—CHARGER TEMPERATURE SENSOR FAULTDefective charger component.If ambient temperatures are extreme, wait until temperatures become more normal to see whether the problem persists.
FAULT NO. 128/228—INVERTER TEMPERATURE SENSOR FAULTDefective Inverter/Charger component.If ambient temperatures are extreme, wait until temperatures become more normal to see whether the problem persists.
FAULT NO. 129/229—HIGH BATTERY VOLTAGE1. Batteries are misconnected.
2. External battery charger or charger connections.
1. Check battery cables and connections.
2. If an external battery charger is connected, verify connections.
FAULT NO. 131/231—INVERTER OVER TEMPERATUREInsufficient air flow.Check Inverter/Charger enclosure airflow.
1. Remove bags and other items stored in the enclosure.
2. Remove items blocking the Inverter/Charger air inlet and outlet openings.
FAULT NO. 132/232—INVERTER TEMPERATURE SENSOR FAULTDefective Inverter/Charger component.If ambient temperatures are extreme, wait until temperatures become more normal to see whether the problem persists.
FAULT NO. 134/234—BOOST CURRENT FAULTLoads greater than 8kW were rapidly and repeatedly cycled while boosting.Reduce AC transient loads.
FAULT NO. 135/235—INVERTER PROCESSOR FAULT1. Inverter/Charger EE memory did not download completely.
2. Inverter/Charger EE memory failed.
Contact an authorized Cummins Onan dealer.
FAULT NO. 136/236—POWER UNIT UNDER VOLTAGE1. Engine speed did not ramp up fast enough to meet a large transient load.
2. PMA is faulty.
3. Governor actuator is faulty.
4. This occurs under unbalanced load operation in the field.
5. Windings of the primary inverter have voltage sensing capability. 3 phase windings from Power Unit maybe reversely connected to the primary and secondary inverters. This causes the Power Unit to drop the voltage when load was only applied to the primary inverter since the alternator was actually sensing the secondary inverter voltage instead of the primary inverter voltage
Reduce loads.
FAULT NO. 137/237—INVALID SYSTEM CONFIGURATIONThe system is not configured correctly.Contact an authorized Cummins Onan dealer.
FAULT NO. 138/238—HIGH AC CURRENTToo many loads on at once.1. Reduce loads.
2. Check loads for short circuits.
FAULT NO. 139/239—LOW BATTERY VOLTAGE1. Loads were greater than 8 kW for too long while running in Inverter Mode.
2. The battery cables are too long.
3. The battery cable connections are miswired, loose or corroded.
4. Charging circuit not functioning.
5. Batteries are wearing out.
6. Blown battery Fuse (400 Amp) . Indicated by dead operator panel. Only Shore Mode works.
1. Reduce loads.
2. Verify battery connections.
3. Charge batteries.
4. Check battery size.
5. Test batteries.
FAULT NO. 141/241—POWER UNIT BREAKER OPEN1. Breaker on Power Unit is open.
2. There is an open/loose connection between Power Unit and Inverter/Charger.
3. There is an open/loose connection in Power Unit between PMA and circuit breaker.
Check Power Unit circuit breaker.
FAULT NO. 142/242—INVERTER PROCESSOR FAULT1. Inverter/Charger Program memory did not download completely.
2. Inverter/Charger EE memory failed.
Contact an authorized Cummins Onan dealer.
FAULT NO. 143/243—INVERTER PROCESSOR FAULT1. Inverter/Charger Data memory did not download completely.
2. Inverter/Charger EE memory failed.
Contact an authorized Cummins Onan dealer.
FAULT NO. 145/245—LOSS OF DC BUS VOLTAGE1. Breaker between Transfer Switch and Inverter/Charger is open.
2. Failed Inverter/Charger component.
1. In Inverter Mode, check battery connections and voltage.
2. In Shore Mode, check all circuit breakers, and to verify that the Inverter/Charger is able to communicate, cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect. Note that it is possible to get fault 176/276 after closing any circuit breakers that may have tripped.
FAULT NO. 146/246—POWER SUPPLY FAULT1. Faulty wiring.
2. Low Battery Voltage.
Contact an authorized Cummins Onan dealer.
FAULT NO. 148/248—INVERTER CURRENT SENSOR FAULTDefective Inverter/Charger component.Contact an authorized Cummins Onan dealer.
FAULT NO. 156/256—INVERTER TEMPERATURE SENSOR FAULTDefective Inverter/Charger component.If ambient temperatures are extreme, wait until temperatures become more normal to see whether the problem persists.
FAULT NO. 158/258—HIGH BATTERY TEMPERATURE WARNING1. Charge/Discharge rate was too high for too long.
2. Battery enclosure does not have sufficient airflow.
3. Corrosion on battery sensor or cables.
4. Bad batteries.
1. Let batteries cool down.
2. Reduce loads.
3. Verify correct battery type settings.
4. Check battery compartment for airflow.
5. Check connections.
6. Replace batteries.
FAULT NO. 162/262—INVERTER FAN WARNING1. Open/Loose connections (3 wire).
2. Faulty fan.
Contact an authorized Cummins Onan dealer.
FAULT NO. 163/263—BOOST OVER TEMPERATURE1. Insufficient air flow.
2. Defective Inverter/Charger component.
Remove load and wait 10 minutes to cool down.
FAULT NO. 164/264—BOOST TEMPERATURE SENSOR FAULTDefective Inverter/Charger component.If ambient temperatures are extreme, wait until temperatures become more normal to see whether the problem persists.
FAULT NO. 165/265—BOOST/CHARGER OVER CURRENT FAULT1. Coolant was very hot when a large load was applied.
2. When the system was boosting, loads greater than 8kw were rapidly and repeatedly cycled.
3. When the system was charging there was a short to battery side of Inverter/Charger.
1. Check coolant level and repair leaks as necessary.
2. Turn the air conditioning thermostat OFF, restart Generator Mode or connect Shore Power, and then turn the thermostat ON again. (This resets the thermostat so that it will start the air conditioners in sequence rather than all at once, greatly reducing the AC transient load on the Hybrid Power System.)
FAULT NO. 168/268/368/468—UNKNOWN FAULTThe software has not been updated to the proper version.Contact an authorized Cummins Onan dealer.
FAULT NO. 171/271—BOOST OVER CURRENT1. In Inverter Mode: Load greater than 3 kw.
2. In Generator Mode: Load greater than 10 kw.
3. Large transient loads when there are low batteries.
4. Worn out or defective batteries.
1. Reduce loads.
2. Check battery conditions. Charge/replace if necessary.
FAULT NO. 172/272—INVALID SOFTWARE CONFIGURATIONInverter/Charger was shipped with functional test software.Contact an authorized Cummins Onan dealer.
FAULT NO. 173/273—CHARGER OUTPUT SHORT CIRCUIT1. Battery connections or condition.
2. Loads or coach wiring.
Turn the Coach DC Disconnect Switch to Disconnect:
1. Check battery connections.
2. Check for shorts across battery terminals.
3. Check battery voltage.
4. Check battery condition.
FAULT NO. 174/274—BOOST FAULT1. Alternator short to ground.
2. Low or dead batteries.
3. Blown battery Fuse (400 Amp) . Indicated by dead operator panel. Only Shore Mode works.
1. Check battery voltage.
2. Charge/Replace batteries if necessary.
3. Replace the blown battery fuse (p. 6-6).
FAULT NO. 176/276—CHARGER FAULT1. AC distribution panel circuit breaker is OFF.
2. There are loose or missing wires between the Inverter/Charger and the AC distribution panel.
3. Missing communication connections between Inverter/Charger (J13) and tranfer switch (J2).
4. DC / battery power is not available to inverter/Charger and Transfer Switch.
5. Soft start or resistor in the Inverter/Charger failed.
Turn the distribution panel circuit breaker ON.
FAULT NO. 181/281—COMMUNICATIONS FAULTLoose or missing connection.Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 182/282—COMMUNICATION FAULT1. Loose or missing connection.
2. Failed Inverter/Charger.
Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 183/283—COMMUNICATION FAULT1. Loose or missing connection.
2. ECM is asleep.
Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 184/284—COMMUNICATION FAULTLoose or missing connection.Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 185/285—COMMUNICATIONS FAULTLoose or missing connection.Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 186/286—COMMUNICATIONS FAULTLoose or missing connection.Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 187/287—COMMUNICATION FAULT1. Loose or missing connection.
2. ECM is asleep.
Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 189/289—COMMUNICATION FAULTLoose or missing connection.Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 191/291—COMMUNICATION FAULTLoose or missing connection.Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 312—POWER UNIT CONTACTOR FAULT1. Extremely low voltage due to heavy loads or an open breaker.
2. Harness connection or damage.
3. Defective transfer switch component.
Turn the air conditioning thermostat OFF, restart Generator Mode or connect Shore Power, and then turn the thermostat ON again. (This resets the thermostat so that it will start the air conditioners in sequence rather than all at once, greatly reducing the AC transient load on the Hybrid Power System.)
FAULT NO. 313—POWER UNIT CONTACTOR FAULT1. Contactor welded shut due to high current.
2. Defective transfer switch component.
Verify that the Power Unit is off, disconnect loads and wait a few minutes.
FAULT NO. 314—SHORE CONTACTOR FAULT1. Extremely low voltage due to heavy load or open breaker.
2. Defective transfer switch component.
Verify that the shore power cord is disconnected, disconnect loads and wait a few minutes.
FAULT NO. 315—SHORE CONTACTOR FAULT1. Contactor welded shut due to high current.
2. Defective transfer switch component.
Verify that the shore power cord is disconnected, disconnect loads and wait a few minutes.
FAULT NO. 335—TRANSFER SWITCH PROCESSOR FAULT1. Transfer Switch EE memory did not download completely.
2. Transfer Switch EE memory failed.
Contact an authorized Cummins Onan dealer.
FAULT NO. 337—INVALID SYSTEM CONFIGURATIONThe system is not configured correctly.Contact an authorized Cummins Onan dealer.
FAULT NO. 342—TRANSFER SWITCH PROCESSOR FAULT1. Transfer Switch Program memory did not download completely.
2. Transfer Switch Program memory failed.
Contact an authorized Cummins Onan dealer.
FAULT NO. 343—TRANSFER SWITCH PROCESSOR FAULT1. Transfer Switch Data memory did not download completely.
2. Transfer Switch Data memory failed.
Contact an authorized Cummins Onan dealer.
FAULT NO. 374—INVALID SOFTWARETransfer switch was shipped with functional test software.Contact an authorized Cummins Onan dealer.
FAULT NO. 381—COMMUNICATION FAULTLoose or missing connection.Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 382—COMMUNICATION FAULTLoose or missing connection.Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 383—COMMUNICATION FAULT1. Loose or missing connection.
2. ECM is asleep.
Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 385—COMMUNICATION FAULTLoose or missing connection.Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 386—COMMUNICATION FAULTLoose or missing connection.Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 387—COMMUNICATION FAULT1. Loose or missing connection.
2. ECM is asleep.
Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 389—COMMUNICATION FAULTLoose or missing connection.Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 391—COMMUNICATION FAULTLoose or missing connection.Cycle the Hybrid Power System by disconnecting Shore Power (if connected) and turning the Coach DC Disconnect Switch to Disconnect. Wait 10 seconds and then turn it back to Connect.
FAULT NO. 412—LOW OIL PRESSURE1. Low oil level.
2. Open/loose wire connections.
3. Faulty pressure switch.
4. Engine needs service.
Add or drain oil as necessary.
FAULT NO. 414—POWER UNIT OVER CRANK1. Fuel supply.
2. Wiring connections.
3. Faulty starter or solenoid.
4. Faulty external start command.
Fill up with fuel as necessary.
FAULT NO. 419—GOVERNOR ACTUATOR FAULT1. Open/loose wire connections.
2. Faulty actuator.
Contact an authorized Cummins Onan dealer.
FAULT NO. 421—GOVERNOR ACTUATOR OVERLOAD FAULT1. Large loads.
2. Fuel supply.
3. Wire connections.
4. Actuator misadjusted.
5. Faulty actuator.
6. Water ingress.
7. Low engine performance.
Reduce loads.
FAULT NO. 424—ENGINE TEMPERATURE SENSOR FAULTSensor disconnected or broken.Contact an authorized Cummins Onan dealer.
FAULT NO. 425—POWER UNIT OVER VOLTAGE1. High engine speed under no load conditions.
2. Governor actuator is not operating correctly.
Turn the air conditioning thermostat OFF, restart Generator Mode or connect Shore Power, and then turn the thermostat ON again. (This resets the thermostat so that it will start the air conditioners in sequence rather than all at once, greatly reducing the AC transient load on the Hybrid Power System.)
FAULT NO. 426—POWER UNIT UNDER VOLTAGE1. If there was a large transient load added, the engine speed may not have been able to ramp up in time.
2. Alternator is not operating correctly.
3. Governor actuator is not operating correctly.
Reduce loads.
FAULT NO. 427—PMA SENSE LOST1. Loose/Missing wiring connections.
2. Open/shorted stator winding.
3. Faulty ECM.
Contact an authorized Cummins Onan dealer.
FAULT NO. 429—HIGH BATTERY VOLTAGE1. Batteries wired wrong.
2. Incorrect Battery type.
3. External Charger.
1. Check battery connections.
2. Verify battery type and confirm that it is set correctly by using the Operator Panel.
3. If an external battery charger is connected, disconnect it to see whether the problem persists.
FAULT NO. 431—ENGINE OVER SPEED1. Governor actuator misadjusted.
2. Faulty actuator.
3. Speed sense leads have loose or missing connection.
4. Faulty ECM.
Fill up with fuel as necessary.
FAULT NO. 432—STARTER FAULT1. Faulty starter or starter solenoid.
2. Speed sense leads have loose or missing connections.
3. Batteries.
4. Oil viscosity.
Contact an authorized Cummins Onan dealer.
FAULT NO. 434—ENGINE OVER TEMPERATURE1. Low engine coolant.
2. Too many loads at high ambient temp or elevation.
3. Coolant pump belt.
4. Engine coolant pump.
5. Blockage to air inlet or radiator assembly due to poor installation.
1. Check coolant level.
2. Check the cooling system for leaks.
3. Reduce loads if at high ambient temperatures or elevation.
FAULT NO. 435—POWER UNIT PROCESSOR FAULT1. ECM EE memory did not download completely.
2. ECM EE memory failed.
Contact an authorized Cummins Onan dealer.
FAULT NO. 436—ENGINE STOPPED WITHOUT COMMAND FROM CONTROL1. Fuel supply.
2. Governor actuator misadjusted.
3. Faulty actuator.
4. Speed sense leads have loose or missing connections.
5. Wiring connections.
6. Faulty engine.
Fill up with fuel as necessary.
FAULT NO. 437—INVALID SYSTEM CONFIGURATIONThe system is not configured correctly.Contact an authorized Cummins Onan dealer.
FAULT NO. 442—POWER UNIT PROCESSOR FAULT1. ECM Program memory did not download completely.
2. ECM EE memory failed.
Contact an authorized Cummins Onan dealer.
FAULT NO. 443—POWER UNIT PROCESSOR FAULT1. ECM Data memory did not download completely.
2. ECM EE memory failed.
Contact an authorized Cummins Onan dealer.
FAULT NO. 459—INVERTER COOLING SYSTEM FAULT1. Insufficient cooling (liquid not air flow).
2. Pump is not connected correctly or is faulty.
Check the system for coolant leaks and blockages.
FAULT NO. 474—INVALID SOFTWAREPower unit was shipped with functional test software.Contact an authorized Cummins Onan dealer.
FAULT NO. 475—ECM FUSE FAULT (STARTER FUSE)1. Blown starter fuse.
2. Starter or starter solenoid wiring.
Contact an authorized Cummins Onan dealer.
FAULT NO. 476—ECM FUSE FAULT (COOLANT PUMP FUSE)1. Blown coolant pump fuse.
2. Faulty pump wiring.
Contact an authorized Cummins Onan dealer.
FAULT NO. 478—ECM FUSE FAULT (GLOW PLUG FUSE)1. Blown glow plug fuse.
2. Glow plug wiring.
Contact an authorized Cummins Onan dealer.
FAULT NO. 479—POWER UNIT FAN WARNING1. Open/Loose connection (3 wire).
2. Faulty fan in Power Unit.
3. Faulty ECM.
Contact an authorized Cummins Onan dealer.

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